Downloaded it and couldn't find any problems. Some suggested corrections/changes:
the meeting rail on the upper and lower sashes should align (on a traditional window, the are narrower than the other stiles and rails. Likewise on traditional windows the bottom rail on the bottom sash is wider than the others. But I noticed on most vinyl windows this isn't the case.)
Create a generic color such as "window frame" for the frame and sashes so people can simply edit it to get the desired color, without having to repaint the components. Likewise with the window glass.